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PCI: Do not enable AtomicOps by RCiEPs

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Since Root Complex Integrated Endpoints (RCiEPs) attach to a bus that has
no bridge device describing the Root Port, the capability to complete
AtomicOps requests cannot be determined with PCIe methods.

Change default of pci_enable_atomic_ops_to_root() to not enable AtomicOps
requests on RCiEPs.

As far as we know, there are no RCiEPs that need AtomicOps (see Link
below).

Signed-off-by: Gerd Bayer <gbayer@linux.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260330-fix_pciatops-v7-1-f601818417e8@linux.ibm.com
This commit is contained in:
Gerd Bayer 2026-03-30 15:09:44 +02:00 committed by Bjorn Helgaas
parent 6de23f81a5
commit 03ec922f00
1 changed files with 2 additions and 3 deletions
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5
drivers/pci/pci.c
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@ -3692,15 +3692,14 @@ int pci_enable_atomic_ops_to_root(struct pci_dev *dev, u32 cap_mask)
/*
* Per PCIe r4.0, sec 6.15, endpoints and root ports may be
* AtomicOp requesters. For now, we only support endpoints as
* requesters and root ports as completers. No endpoints as
* AtomicOp requesters. For now, we only support (legacy) endpoints
* as requesters and root ports as completers. No endpoints as
* completers, and no peer-to-peer.
*/
switch (pci_pcie_type(dev)) {
case PCI_EXP_TYPE_ENDPOINT:
case PCI_EXP_TYPE_LEG_END:
case PCI_EXP_TYPE_RC_END:
break;
default:
return -EINVAL;